nate951

Ok, I am trying to turbo my stock b16 and am wondering a few things.
1st: I was thinking of using a vortech 12:1 fmu (or similar products) and am wondering how much boost they are good till? I'm looking for something fairly reliable.
2nd: How much boost will my stock bottom end hold? The car has about 50k miles on it and, once again, I am looking for somethign fairly reliable (this is my daily driver).
Thanks

u2civic1

DO A SEARCH FIRST

what kind of turbo?
try not to use fmu they blow alot of motors

Lucky_Smurf

A better question to ask is how much WHP the stock bottom end can handle. Boost will very depending on the turbo but horse power restriction on a stock bottom end is a pretty constant thing. If you want good long term reliablility I'd stay somewhere around 250-275 whp on pump gas and make sure you have it tuned right. Tunning is really the key to longevity.

nate951

not sure what kind of turbo yet
Why do they blow a lot of motors? What makes these so bad?

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nate951 &raquo;</TD></TR><TR><TD CLASS="quote">not sure what kind of turbo yet
Why do they blow a lot of motors? What makes these so bad?
</TD></TR></TABLE>

Basically they dont have a perfect air/fuel ratio for each application.. They are considered acceptable as far as the air/fuel ratio.. Youll hear alot of people on saying that they have to go get their car tuned by a tuner, reason for that is that each setup requires different tuning..

Also the fmu's are bad because of the fuel pressure you need to run.. If your running 40psi of pressure normally, and with the 12:1 fmu its going to add 12psi of fuel pressure per 1psi of boost.. Do the math, at 5psi of boost thats 100psi of fuel pressure.. With the fmu you also need to go with an aftermarket fuel pump since the stock one can make that much pressure for that long before it burns up..

98gsrTEG

your bottom end can hold about a case, maybe 2 if your lucky

spooledex

I would say with a drag kit or something similiar. I wouldn't go higher than 12 psi and run only around 8-9 safely

nate951

How exactly do you tune an FMU (besides getting an adjustable one), just an adjustable fuel pressure regulator? Wouldn't tuning it right once eliminate the fuel pressure being too high problem? If so, then why do people blow their motors on these, is there anything else that is bad about them?

tgreaves

The way the fmu works is that it bumps up the fuel pressure instead of raising the injectors pulse width..

I guess if you had a way to raise the fuel pressure accuatly then you could run a perfect air/fuel ratio.. But you cant with this..

onefstek

STAY AWAY FROM FMU'S.

Get a real tunning tool if you plan on keeping your engine for more then one month. 98ctr

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nate951 &raquo;</TD></TR><TR><TD CLASS="quote">How exactly do you tune an FMU (besides getting an adjustable one)</TD></TR></TABLE>

You dont, thats the problem..

nate951

I see...
well, is it ok for like 8-9 psi? Has anyone heard of anyone having problems at this psi?

onefstek

I would not trust the FMU. At least get an AFC or E-manage.

The blocks are good up to 10-12 psi but thats with good tunning. 98ctr